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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d784f1c97a60eacb54dcaaaff954a04caed60fb5f2d83fe546a7a94e1d02f2' 
  AND token = 'jbj5tuf2uD92iABEOVrw+j7pMIStyUc7e4L78vKAwaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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