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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4821f7f8fb5934ad7bab04b03fbc1152a96fb4ac2e7a3dca17ee5bfa689b59c4' 
  AND token = '5nqzbSckBaprAiC68yNs/Uyh5oeNo6y+lrsFQOAsXn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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