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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262ec627caa771e306cb5080aebb1343215c5076dbcc16c5f7fdd21fa1f0f139' 
  AND token = 'mIZkymAzL9OIpDrqq4ysyjMAsI6RTepo9iRdUL2+IKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}