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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1414227782fad0a44dec6a3db8f8610cc71181074a03df1d3d42cf9ae398e78f' 
  AND token = 'gA6LA3jmUx0WzCxbJSDhihVcXAi88Ti6X0MGlVv9Wno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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