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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d83701a1a0e06a047e24215d107b2217d49bf68a1ea7aa8df73a82789fa1510' 
  AND token = 'cgA+PBngtrIatCT1fR/OTJc/rHFynwM9n/OdnR1MSYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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