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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e19a9ef5c164d43abe9752468962deb5ad2d0dcbe0fc7de86a93025b874729' 
  AND token = 'fK8xQrdxltFcpfUzMNArEALsrR0auI2pJ2c4ADLQi5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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