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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e36d19d3cf9b3a2d9342718ee05480c14ca1ac3d5c306dce6993969f635f64' 
  AND token = 'wjbGerspC/Q5Dy3tbKLM1Qo1UDCp42eoWLgZSGHFccw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00209

JSON explain

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