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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6d2d2dd9097490e7c52783f3b404eb44779cb900b9edb5cb8ab134d71c77ea' 
  AND token = 'm4Hflfn6hqtNYh3OMynOBvV/2m7YLI+uVVyyHP+zHKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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