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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9570b3bdaad10b5a9a777e19c6ce0a2ce370382bfe90f8d1a38bf52ea3da0666' 
  AND token = 'f2DcI+8A88HHB2FISdToLSFG8IXXqdH3JftGISkPANE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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