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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d0ce763dbb99746429c48d9ea740efdfdaba2ff6dd6e765a1aedb519a1e7aa' 
  AND token = 'd+CS5WoCSj2/vhneyN/XEEXoPA7LCmwdKCbIRN9ENIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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