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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c09b99bfaca65b37d408d3025b405572a8b2be86741f904440b69012ad42c8' 
  AND token = 'LEpT1SMr++RExHbc3LC6EIX/5hxDmdqeSv/YR0MuAj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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