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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09d8e495c0562ed359d1a7075d417a51d4d05ea5092cf01c5b3ee0269e4672d' 
  AND token = 'fhFb598OLhLyVyxB738bjTlQNqOKpWKrie7Mmo2wPKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00414

JSON explain

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