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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ab739f6e20fde9986dc2365993b0d181ac8c932a59a2f2077c036eed9385a6' 
  AND token = 'aYpY9BOKqcsQ5EbfJynTCV3RR/fpgK1bq/E4Uf2rVsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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