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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93c9f16b7c1e1b08180f47f1c28fbd45a34d259ef6f93e57fe015c56deaf2f9' 
  AND token = 'uCTFdkI4Y+dHA0nf6HsnPVnWInkdxyxk0WkNGnObx34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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