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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7209d062a58da37572177b5c1214cd11ee9c7aa2a78134dedca542250ae3e789' 
  AND token = 'NeG+arxAg7fLbu6EitUfntZAlqhOMGJUlR0jUj+9bMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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