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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbbdad29f87cf8a1b11f49a6fcf8eff664322fbd89b71872c18f2d423d00a7a' 
  AND token = 'pgLvvZej6ZAVHHIt2QntHj2PVAg4CdHnhMWYfe2tNSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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