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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dae24381efe1b6e09a3d7d92482df7594d0f54bf47e0a7e8136ac85249d1c34' 
  AND token = 'fq32CoHaOWk2O1nPK8cyoSZ+iLc4sjNcTa2Pbr+O2xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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