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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747c3f1664522a768146c3b74476f7899c18886fc160a1e948cabba839fd054d' 
  AND token = 'TtblwTcV2YR59FIpSN3S5adU8SoZ+COEQQ6uPgjwQS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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