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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca150b80af855fd0cb463725b6eb9ebfd2eadab2b6e4784faa5a2e1ebac397d' 
  AND token = 'moT2Ipm3j6shayt8Bl7ka7PSxC/UPrPjd6NAhaf8i3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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