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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bd3d8bba91d14c34ae05add8477f3fadf87217fa9ce717b2f4c211c211e87c' 
  AND token = 'c45PQNvadfYRMRWgMtCkNFTi8g3FQEunmynEeWKBsMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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