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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01c6a7fa68165e17adf5e9effcbf85df3278d9bee37c3dc51cca939bd8fdfcc' 
  AND token = 'VgH/Xo4empOoUzxM8tjlGQIXikYGVt+bxffl4Y+QeQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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