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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5e03b7feba9467962f5c9b2d57e9e38efd82fa4b1226f6007680ab49baa34b' 
  AND token = 'g10WMP1Ku71JpP3a6X20lytML71idBNZBoQk0GOBUoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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