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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2cc3cbc4dcdf1234cd703d1cade1e1a3b540782777b9ef5da2c06183945fac' 
  AND token = '0yJSJ8g32jci0W+TGpDSWRAsKsiKAp7tnIx2raN3pS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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