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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ea2cf9bd71086239903010bd3a11490a16d1816777491da7c86a04f50487dd' 
  AND token = 'oTswFL2vXCjf9WCpkCgxSVMG57oTkyvq/d132hpkP4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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