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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd236806bd954549d64d9b2fec39a57a3fd4619299f2c3b3c2117911995ff27b' 
  AND token = 'RIT3WOcd3nSrgORaKjISuCjaIpFkgIZHmnG4LkkwwC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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