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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d5992cc2e83a9d0428eec91636df32bce1645689d045011b0b369fb2d3e055' 
  AND token = 'z2C+nxzQgtwbFtk5JiL9XtDdgv7vg4J5Rkhp+gM1eQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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