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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9581afc6e3ffc76f6cf1fb1d7c4947e0e21dfeb42f48a99ba507bb07bc2b8b2' 
  AND token = 'xOgS+s2PaXqZFfK27Jsqv6KAsA3PLs1SoVgX+NLoDgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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