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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a6318c8791621b0b71ceca2c55ce0a0e0880781d41484a4cb243f667de3253' 
  AND token = 'IYVkxZJTNZ3OqBevUxZ39xKdK/3igNI8J8J/qUzB4Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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