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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360cbc72d0265ea8af1ac5b6c37d2f3394e367f8480660ddc2ac0e90969a411b' 
  AND token = '+pzj0Cgavu4f9416WrPi4bdzE43FOqlfiRm7bUlE1Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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