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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40cda04dae2993d1a037b7d7ffe07531f95320661bc9259f12405345a6f9dac' 
  AND token = 'Ip68Pb3TTfaS/VntOkwpbzCBgvElcINc8M+sX4pns7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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