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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2982e6a5aa565b292722c738e22aa0d115f41d50cb2af25010c4e5b3389a4e' 
  AND token = 'b+V0yuZe0pCgrXttWdzBKP/0Ze8US4cyIrl50gWwp8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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