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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b895c0430c99a2cb7277b1624655c1cd199bdda7656c1e65f509881876ee7512' 
  AND token = '90m55qqMdnxv138CDAVKhDpPWG6mK1S2qF/Zm/MgrRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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