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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c713ca260221ee8b9ec2d74ee772fb6e5d81b53e2641e7875f7ab869a1e1486d' 
  AND token = '+K0+e8FLou8aOj5Px7Iq1ruXSKtqEQwVs9+GkzwWYMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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