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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0e3a271d0c3de407154920e51d7f6133f8a13e91a1041be403ae0fd47487d7' 
  AND token = 'Vz5ppBjGkkcEyQslPV07+hpvd6dxDiSxOHkThJnpKPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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