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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d3ca7e4fae0e85a3411fbbbc519b4cae0df276bbb609cf3ccb74a921dc2f255' 
  AND token = 'x/WF+cbPXG3C+N245g5TuhH9AYiizxzeLGBFxrsyW1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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