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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8412553fc857a9b29a212224c73919a77da3b0ce2b7fef7c26cfec826d4db9' 
  AND token = 'DUuH2aoXFGLjD0UF5RTmJlA6Vlbtl3+I7zOar5m29Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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