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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8624cd6ce5f8637ef3f4c1ae14781df27211885b03c85b892c396714aaec31' 
  AND token = 'ikpDTCH8pY1ir92n42BEgUiNBJtekMD7a2OVAk6SjZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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