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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a43e786e59ecb39324009343f29327085380191810ba7bec0ece9b26c03caeb' 
  AND token = 'PgNcY6TJhLCnYwO22d7lqlqZn9P40wum3dK3yUc8XNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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