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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ce4aa9c3ce6750e9d8b4d3d96181958ac96132412f9555d04cb8a3e14b143f' 
  AND token = '1FOJOEZ/QLMVbQ2PAOeK99cin1/hwnTy8LygO8KxlkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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