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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d80f0600fde516b7379238439e52ef990c06c356baba45755b58203f314b88e' 
  AND token = 'onuEz3Z4pXenN4FnXv8Giuy7OJmyv9ke0nIIJ+g2Aqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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