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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d2ebed138fecf1fdadbe354b102d34f70d45ac83dfdc0cb0bc5c887662e811' 
  AND token = 'CfxKaFy8aBt8n6bEzG8n1nlNGJQJOmzVmH8Kuyz7BuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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