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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1630fb075fc2a6c22fb6eaa99349409aadda8d1f29d918861552d63252030ab2' 
  AND token = '+9qWQUmGIeK7JPj5z5HueVbInSiIo2Rg2+JW7e+TdV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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