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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b7c83a7727f4a64433e7e2dcaa0c55a1bc8997a790d67b5e0141f4286840f8' 
  AND token = 'wP96711OAywza6RTZS4B6vdDHMqz8er1NnhwWBceJuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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