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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a023a59d8436f72d205ba0cb54d8bbba6f1731a1ad83a0b6e14e30e5ab9031e' 
  AND token = '/g/KLdycB6KgIn328//pHxAYEx0ez2mous743k/Pv0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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