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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077e71280e557b43cc9f051b1c77b2ff5e047fc196a418f6ff23a3405ec5d980' 
  AND token = 'fdS0YIQc1gcHEUXi0+CaS8ROi6FqFnYgEkzEyLkuHWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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