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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e7e119cca231ac2973204c15ac834e02b306cf6e37009973a826cc4a7a33cc' 
  AND token = '1o4e9e81/4LC9d8J3pFA7MtNWLQNlDQVVIYJIBx+u1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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