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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4d12b60b40cd8b7ec1107fc4ab5116e34c4f74ef822d55e45cefcc5e2b3d4d' 
  AND token = '/tTKKzhyz1Zq6Vdx3ZHKpa5CzJmJ3DM3BxEOFA++v3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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