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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6ec9e6ff7f762f3c10f5845d2b8de1be837e2b0585a6b47ba4b92ebc951051' 
  AND token = 'qJ12pzDsvp8NCv56i5d9eX35jiKm2BCDsNoFUcC1qJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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