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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d53e7ce7444ca04f322cea1ebfdc8eb970db5217fd8a180fa7ce56713fdb57' 
  AND token = '4GNu6fakGwWd1fZeYPWXDWBQfpsW/tvQEd5tas/Ed8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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