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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cf6f19dcf32919464a1e317fac04f238e78d1c34fa7c5408f6c980078565e4' 
  AND token = 'uJfGH0jE/smCNXFU8WzAUSFVkKttXTsDVcvrnHN9JuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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