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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868d586117dfd3bd25a90dd7368dca3f1f7a709e4915aacd97d3b56ef755f7e7' 
  AND token = 'IeW+CJQFbbA4cgu81kv69RalZVDr9sfK8MPW13DVYCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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