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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7378c230606d77a46efa5548818e5d2223b0ffc5935845ca871eafe80d003367' 
  AND token = 'eHFLLFPpbQhSw70MKt42FHz9p7Uvtdq3dHOKs6MIdcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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