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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c142fb064c571fbc1f7b7897ea2db94052127bca2fd7be3a6a73ad20149a63' 
  AND token = 'J/gu9NMScokB7wIYPw6TgvHgTFB8r2xuWSaoEK74og4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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