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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364f34f6cf6d3f5e6a534da0391b50561b838151e61a37acf7accb37a9c40bab' 
  AND token = 'PMbWkXgwosPYsmfW2bxUtEuZIocKAclJs7OFE+Ju364=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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