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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e71a6c088bc5c95f4c00145ccd03e1d8ea802f695279a82418509224801d02d' 
  AND token = '+I7czIxr/+rbOuIhtoRiSlC3usoKh4Tep+p0QefRGeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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