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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cba7ce521d688615cf297b5999714b90cb7b96561017cfc8bd9ac5e2c503c3' 
  AND token = 'HIdoHo1mglyfpVZ0c6O9afBRkSaLWKCHjGcr9KSUxqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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