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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde70961e838b1e7e2fb0c436ae733920013cd292fba8a7b9449f71b9f954106' 
  AND token = 'tWjm4TDUcs+i8swtXrX1Rz8bD3bgGJuXjDuT7843MHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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