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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4445bf0f6377be3b3aef8e623bb5405b03073768bf4e2ba5ea8f5080395e1aa' 
  AND token = 'fG2wBN9fTZkqrVsf5BR13C5URYm7pu+6xqmAKnrTVEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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