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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b9b2777cc936ccb3f33be022de5668f8007135f7e7c56973e818d320e7bdc5' 
  AND token = 'fylbmLZ7DUojOASQZgYnDHSXANdV6rr7C+OR5iKEJVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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