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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3078128f0dd8824881c200ebcfe1d3d86606f516122b214e135c87288a4034' 
  AND token = 'xiidpkT44KVLPjYzwdIz7bbW1yXjQ3OgVmA2WoK2s2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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